<%--
  Created by IntelliJ IDEA.
  User: Lenovo
  Date: 2022-04-26
  Time: 10:00
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    在四个范围中去取值(同一会话)：
    <br>
    pageContext:<%=pageContext.getAttribute("msg")%>
    <br>
    request:<%=request.getAttribute("msg")%>
    <br>
    session:<%=session.getAttribute("msg")%>
    <br>
    application:<%=application.getAttribute("msg")%>
</body>
</html>
